<?php
/**
 * new WordPress Widget format
 * WordPress 2.8 and above
 * @see http://codex.wordpress.org/Widgets_API#Developing_Widgets
 */
class Duster_Ephemera_Widget extends WP_Widget {

	/**
	 * Constructor
	 *
	 * @return void
	 **/
	function __construct() {
		parent::__construct( 'widget_duster_ephemera', esc_html__( 'Duster Ephemera', 'duster' ), array(
			'classname'   => 'widget_duster_ephemera',
			'description' => esc_html__( 'Use this widget to list your recent Aside, Status, Quote, and Link posts', 'duster' )
		) );

		add_action( 'save_post', array(&$this, 'flush_widget_cache' ) );
		add_action( 'deleted_post', array(&$this, 'flush_widget_cache' ) );
		add_action( 'switch_theme', array(&$this, 'flush_widget_cache' ) );
	}

	/**
	 * Outputs the HTML for this widget.
	 *
	 * @param array An array of standard parameters for widgets in this theme
	 * @param array An array of settings for this widget instance
	 * @return void Echoes it's output
	 **/
	function widget( $args, $instance ) {
		$cache = get_transient( 'widget_' . $this->id );

		if ( $cache ) {
			echo $cache;
			return;
		}

		ob_start();
		extract( $args, EXTR_SKIP );

		$title = apply_filters( 'widget_title', empty($instance['title']) ? esc_html__( 'Ephemera', 'duster' ) : $instance['title'], $instance, $this->id_base);

		if ( ! isset( $instance['number'] ) )
			$instance['number'] = '10';

		if ( ! $number = absint( $instance['number'] ) )
 			$number = 10;

		$ephemera_args = array(
			'order' => 'DESC',
			'posts_per_page' => $number,
			'nopaging' => 0,
			'post_status' => 'publish',
			'post__not_in' => get_option( 'sticky_posts' ),
			'tax_query' => array(
				array(
					'taxonomy' => 'post_format',
					'terms' => array( 'post-format-aside', 'post-format-link', 'post-format-status', 'post-format-quote' ),
					'field' => 'slug',
					'operator' => 'IN',
				),
			),
		);
		$ephemera = new WP_Query();
		$ephemera->query( $ephemera_args );

		if ( $ephemera->have_posts() ) :

		echo $before_widget;
		echo $before_title;
		echo $title; // Can set this with a widget option, or omit altogether
		echo $after_title;

		global $post;

		?>
		<ol>
		<?php while ( $ephemera->have_posts() ) : $ephemera->the_post(); ?>

			<?php if ( 'link' != get_post_format( $post->ID ) ) : ?>

			<li class="entry-title">
				<a href="<?php the_permalink(); ?>" rel="bookmark"><?php the_title(); ?></a>
				<span class="comments-link">
					<?php comments_popup_link( __( '0 <span class="reply">comments &rarr;</span>', 'duster' ), __( '1 <span class="reply">comment &rarr;</span>', 'duster' ), __( '% <span class="reply">comments &rarr;</span>', 'duster' ) ); ?>
				</span>
			</li>

			<?php else : ?>

			<li class="entry-title">
				<?php
					$link_url = get_permalink();

					if ( false != duster_url_grabber() )
						$link_url = duster_url_grabber();
				?>
				<a href="<?php echo esc_url( $link_url ); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to %s', 'duster' ), the_title_attribute( 'echo=0' ) ) ); ?>" rel="bookmark"><?php the_title(); ?>&nbsp;<span>&rarr;</span></a>
				<span class="comments-link">
					<?php comments_popup_link( __( '0 <span class="reply">comments &rarr;</span>', 'duster' ), __( '1 <span class="reply">comment &rarr;</span>', 'duster' ), __( '% <span class="reply">comments &rarr;</span>', 'duster' ) ); ?>
				</span>
			</li>

			<?php endif; ?>

		<?php endwhile; ?>
		</ol>
		<?php

		echo $after_widget;

		// Reset the global $the_post as this query will have stomped on it
		wp_reset_postdata();

		// end check for ephemeral posts
		endif;

		$cache = ob_get_flush();
		set_transient( 'widget_' . $this->id, $cache );
	}

	/**
	 * Deals with the settings when they are saved by the admin. Here is
	 * where any validation should be dealt with.
	 **/
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['number'] = (int) $new_instance['number'];
		$this->flush_widget_cache();

		return $instance;
	}

	function flush_widget_cache() {
		delete_transient( 'widget_' . $this->id );
	}

	/**
	 * Displays the form for this widget on the Widgets page of the WP Admin area.
	 **/
	function form( $instance ) {
				$title = isset($instance['title']) ? esc_attr($instance['title']) : '';
				$number = isset($instance['number']) ? absint($instance['number']) : 10;
		?>
				<p><label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php esc_html_e( 'Title:', 'duster' ); ?></label>
				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>

				<p><label for="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>"><?php esc_html_e( 'Number of posts to show:', 'duster' ); ?></label>
				<input id="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'number' ) ); ?>" type="text" value="<?php echo esc_attr( $number ); ?>" size="3" /></p>
		<?php
	}
}

add_action( 'widgets_init', function() {
    return register_widget( 'Duster_Ephemera_Widget' );
} );